Many electronic circuits related to fan speed controlling have been published here and this one is just another approach. The circuit diagram shown here is of 12V DC fan speed controller using the IC LM2941CT which is a low drop out 1A voltage regulator. The IC has a dropout voltage as low as 0.5 and has also many useful features like power supply reverse protection, thermal protection, short circuit protection etc. The maximum output current the IC can source is 1A.
The 12V DC supply is connected between the Vin (pin4) and ground (pin3) of the IC. The load, which is the fan, is connected across the Vout (pin5) and ground (pin3) of the IC. The network comprising of potentiometers R1, R2 and resistor determines adjust current (Iadj) of the IC. By varying the Iadj using the POT R2 we can adjust the output voltage of the IC and hence the fan speed.Circuit diagram.

i am trying to make the circuit to my college project. How to make the project and please send the layout the circuit and explanation of the circuit. . . .
Please to help me for to complete the project. . .

Hello guys, I am trying to make this circuit as my college project. I got the required output on breadboard but fail to get output on pcb when layout done on eagle software; I guess I dont know to use the eagle software. So can any1 please mail me the layout of this circuit on ANKIL19@hotmail.com ? It will be of tremendous help. thank you